1 files changed, 92 insertions, 0 deletions
diff --git a/examples/charts/memoryusage/memoryusage.py b/examples/charts/memoryusage/memoryusage.py
new file mode 100644
index 000000000..3ba42368e
--- /dev/null
+++ b/examples/charts/memoryusage/memoryusage.py
@@ -0,0 +1,92 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+"""PySide6 Charts example: Simple memory usage viewer"""
+
+import os
+import sys
+from PySide6.QtCore import QProcess
+from PySide6.QtWidgets import QApplication, QMainWindow
+from PySide6.QtCharts import QChart, QChartView, QPieSeries
+
+
+def run_process(command, arguments):
+    process = QProcess()
+    process.start(command, arguments)
+    process.waitForFinished()
+    std_output = process.readAllStandardOutput().data().decode('utf-8')
+    return std_output.split('\n')
+
+
+def get_memory_usage():
+    result = []
+    if sys.platform == 'win32':
+        # Windows: Obtain memory usage in KB from 'tasklist'
+        for line in run_process('tasklist', [])[3:]:
+            if len(line) >= 74:
+                command = line[0:23].strip()
+                if command.endswith('.exe'):
+                    command = command[0:len(command) - 4]
+                memory_usage = float(line[64:74].strip().replace(',', '').replace('.', ''))
+                legend = ''
+                if memory_usage > 10240:
+                    mb = memory_usage / 1024
+                    legend = f'{command} {mb}M'
+                else:
+                    legend = f'{command} {memory_usage}K'
+                result.append([legend, memory_usage])
+    else:
+        # Unix: Obtain memory usage percentage from 'ps'
+        ps_options = ['-e', 'v']
+        memory_column = 8
+        command_column = 9
+        if sys.platform == 'darwin':
+            ps_options = ['-e', '-v']
+            memory_column = 11
+            command_column = 12
+        for line in run_process('ps', ps_options):
+            tokens = line.split(None)
+            if len(tokens) > command_column and "PID" not in tokens:  # Percentage and command
+                command = tokens[command_column]
+                if not command.startswith('['):
+                    command = os.path.basename(command)
+                    memory_usage = round(float(tokens[memory_column].replace(',', '.')))
+                    legend = f'{command} {memory_usage}%'
+                    result.append([legend, memory_usage])
+
+    result.sort(key=lambda x: x[1], reverse=True)
+    return result
+
+
+class MainWindow(QMainWindow):
+
+    def __init__(self):
+        super().__init__()
+
+        self.setWindowTitle('Memory Usage')
+
+        memory_usage = get_memory_usage()
+        if len(memory_usage) > 5:
+            memory_usage = memory_usage[0:4]
+
+        self.series = QPieSeries()
+        for item in memory_usage:
+            self.series.append(item[0], item[1])
+
+        chart_slice = self.series.slices()[0]
+        chart_slice.setExploded()
+        chart_slice.setLabelVisible()
+        self.chart = QChart()
+        self.chart.addSeries(self.series)
+        self._chart_view = QChartView(self.chart)
+        self.setCentralWidget(self._chart_view)
+
+
+if __name__ == '__main__':
+    app = QApplication(sys.argv)
+    main_win = MainWindow()
+    available_geometry = main_win.screen().availableGeometry()
+    size = available_geometry.height() * 3 / 4
+    main_win.resize(size, size)
+    main_win.show()
+    sys.exit(app.exec())